2013/12/23 by Zhe Chang, Sai Wang, Chang, Zhe +1
Earth and Planetary Sciences · Physics and Astronomy · #Cosmology and Gravitation Theories #Cosmology and Nongalactic Astrophysics (astro-ph.CO) #FOS: Physical sciences #General Relativity and Quantum Cosmology (gr-qc) #Geophysics and Gravity Measurements #High Energy Physics - Theory (hep-th) #Relativity and Gravitational Theory #astro-ph.CO #gr-qc #hep-th
paper · pdf · doi:10.48550/arxiv.1312.6575
12 pages, 2 figures
openalex publication_date 2013/12/23 · arxiv created 2014/05/10 · arxiv updated 2014/05/13 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
Both the Wilkinson Microwave Anisotropy Probe (WMAP) and Planck observations reported the hemispherical asymmetry of the cosmic microwave background (CMB) temperature fluctuation. The hemispherical asymmetry might be stemmed from the primordial statistical anisotropy during the inflationary era of the universe. In this paper, we study possible implications of the primordial power spectra with dipolar anisotropy on the CMB temperature fluctuation and polarizations. We explicitly show that the statistical dipolar anisotropy may induce the off-diagonal (\(ℓ'≠ℓ\)) TT, EE, BB, and TE correlations, as well as the diagonal (\(ℓ'=ℓ\)) TB and EB spectra. In particular, these correlation coefficients are expected to be \(m\)-dependent generically. These signals of statistical anisotropy might be tested by CMB observations in future.